CN112901154B - Slow-solubility solid isotope source and well logging and interpretation method thereof - Google Patents
Slow-solubility solid isotope source and well logging and interpretation method thereof Download PDFInfo
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Abstract
The invention discloses a slow-solubility solid isotope source and a logging and interpretation method thereof, wherein the preparation method of the slow-solubility solid isotope source and the logging and interpretation method thereof comprise the following steps: isotope mixed liquor and a slow-soluble solid shell; the isotope mixed liquor is positioned in the slow-soluble solid shell, and the slow-soluble solid shell is provided with pressure transmission micropores; the slow-soluble solid shell is used for preventing the isotope mixed liquid from diffusing too fast underground or fouling the well wall. The problems that in the prior art, isotope microsphere particles are seriously stained on a well wall, peak values on a tracing curve show high value abnormity and can be misjudged as leakage points, and isotope microsphere particles are diffused too fast underground, so that a logging instrument cannot accurately track and detect are solved.
Description
Technical Field
The invention relates to the field of oil field logging, in particular to a slow-dissolving solid isotope source and a logging and interpretation method thereof.
Background
In the prior oil field well logging work, when the well section is checked to leak, isotope microsphere particles are released underground through a releaser, isotopes diffuse and move underground, the isotopes are tracked and detected at different points in the well through a well logging instrument by utilizing the radioactivity of the isotopes, and then the tracing curve results obtained after detection are explained, so that whether the leakage condition exists in each well section or not is judged. The prior isotope microsphere particles have the problems of polluting the well wall and diffusing too fast when being directly released into the well. The isotope microspheres are attached to the well wall, so that the peak value of a tracing curve shows high-value abnormity, and the tracing curve can be misjudged as a leakage point during interpretation, so that the real leakage point cannot be distinguished; and the isotope microsphere particles can not accurately track and monitor the peak value by a logging instrument due to the too fast underground diffusion, so that the logging fails.
Disclosure of Invention
In view of the above, the present invention provides a slow-soluble solid isotope source and a well logging and interpretation method thereof, so as to solve the following problems existing in the prior well logging using isotope microsphere particles: 1. the isotope microsphere particles are seriously stained on the well wall, so that the peak value on a tracing curve shows high value abnormity, and the isotope microsphere particles can be misjudged as leakage points. 2. The isotope microsphere particles diffuse too fast underground, which causes the problem that a logging instrument cannot accurately track and detect.
In a first aspect, the present invention provides a slow-soluble solid isotope source comprising: isotope mixed liquor and a slow-soluble solid shell;
the isotope mixed liquor is positioned in the slow-soluble solid shell, and the slow-soluble solid shell is provided with pressure transmission micropores;
the slow-dissolving solid shell is used for preventing the isotope mixed liquid from diffusing too fast underground or polluting the well wall.
Preferably, the slow-soluble solid shell is a spherical shell;
the interior of the spherical shell is hollow, and the isotope mixed solution is positioned in the spherical shell;
the spherical shell is made of organic slow-soluble material.
Preferably, the isotope mixture solution includes: isotope microspheres and lipid organic matter.
Preferably, the mass ratio of the slow-soluble solid shell, the isotope microspheres and the lipid organic matter is as follows: the mass ratio of the slow-soluble solid shell is as follows: 60% -65%, wherein the isotope microspheres comprise the following components in percentage by mass: 30-35%, wherein the lipid organic substances account for the following weight ratio: 5 to 9 percent.
In a second aspect, the present invention provides a method of logging a well, comprising the steps of:
loading the slow-soluble solid isotope source into a releaser, and releasing the slow-soluble solid isotope source into the measuring well;
injecting water into the measuring well;
and (3) putting a logging instrument into the measuring well, and performing well division and point measurement on the measuring well to obtain a tracing curve of the slow-dissolving solid isotope source moving in the measuring well.
In a third aspect, the present invention provides a well logging interpretation method, comprising the steps of:
acquiring two tracing curves of the slow-soluble solid isotope source in the measuring well;
finding out the frontal values of the measuring points on the two tracing curves respectively, and subtracting the time corresponding to the two peak values to obtain the time difference;
acquiring basic information of a measuring well;
calculating the flow of the measuring point through a flow formula according to the basic information and the time difference;
and respectively calculating the flow rates of all measuring points in the measuring well, calculating the absolute water absorption capacity of the measuring well section between every two adjacent measuring points by a decreasing difference value method according to the flow rates, and if the absolute water absorption capacity is larger than a preset value, the measuring well section has leakage.
Preferably, the basic information includes: the cross-sectional area of the oil jacket annulus in the measuring well, the injected water quantity of the measuring well and the distance between two detectors of the double-probe short section of the logging instrument are measured.
Preferably, the flow formula comprises:
in the formula:
q is the flow of the measurement point, m 3 D; s is the cross-sectional area of the oil sleeve annulus, m2; l is the distance between two probes of the double-probe short section, m; t is the time difference, s.
Preferably, the decreasing difference formula comprises:
Q 0 ＝Q 1 -Q 2 …………………Q n ；
in the formula:
Q 0 for measuring absolute water absorption of well section, m 3 /d；Q 1 、Q 2 ……Q n For measuring the flow at the measuring point of the well section, m 3 /d。
The invention has the following beneficial effects:
the invention provides a slow-soluble solid isotope source and a well logging and interpretation method thereof, which solve the problems that isotope microsphere particles are seriously polluted on a well wall, the peak value on a tracing curve shows high value abnormality and can be misjudged as a leakage point and the isotope microsphere particles are diffused too fast underground to cause that a well logging instrument cannot accurately track and detect by adding a slow-soluble solid shell as an isotope microsphere carrier.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a slow-soluble solid isotope source according to an embodiment of the present disclosure.
Fig. 2 is a partial view of a trace curve of a slow dissolving solid isotope source moving in a measurement well according to an embodiment of the invention.
In the figure: 1-slow-dissolving solid shell, 2-isotope microsphere and 3-pressure transmission micropore.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic structural diagram of a slow-soluble solid isotope source according to an embodiment of the present invention. As shown in fig. 1, a slow-soluble solid isotope source comprises: isotope mixed liquid and a slow-soluble solid shell 1; the isotope mixed solution is positioned in a slow-soluble solid shell 1, and the slow-soluble solid shell 1 is provided with pressure transmission micropores 3; the slow-soluble solid casing 1 is used for preventing the isotope mixed liquid from diffusing too fast underground or polluting the well wall.
In the embodiment of the invention, during logging, the slow-soluble solid shell 1 filled with isotope mixed liquor is put into the well, and the slow-soluble solid shell 1 is slowly dissolved in water and cannot be hung and adhered to the well wall during downhole movement. Set up on the solid shell of slow solubility 1 and pass pressure micropore 3, pass pressure micropore 3 and be the through-hole, the inside and well environment of the solid shell of intercommunication slow solubility 1 for make when the solid shell of slow solubility 1 is in the pit, internal pressure is the same with environment pressure in the pit, prevents to scatter because of the too big of downhole pressure.
In the present invention and fig. 1, the slow-soluble solid casing 1 is a spherical shell; the inside of the spherical shell is hollow, and the isotope mixed liquid is positioned in the spherical shell; the material of the spherical shell is organic slow-soluble material.
In the embodiment of the invention, the shell material of the spherical shell can be selected from fracturing organic temporary plugging agents, the temporary plugging agents are ground into a spherical shape with the diameter of 5mm-8mm, the interior of the spherical shell is hollowed into a hollow shell with the wall thickness of about 2mm, and three pressure transmission micropores 3 are drilled on the hollow shell. The isotope mixed liquid is sealed in the spherical shell.
In the present invention and fig. 1, the isotope mixture solution includes: isotope microsphere 2 and lipid organic matter.
In the embodiment of the invention, the isotope microsphere 2 is mixed with lipid organic matter powder and used for adjusting the density of the slow-soluble solid shell 1 and the isotope microsphere 2, so that the density of the isotope microsphere 2 and the slow-soluble solid shell 1 is close to that of water, the isotope microsphere 2 and the slow-soluble solid shell can move at the same speed along with water flow in a downhole, and the influence of the slippage speed on a logging result is reduced to the maximum extent.
In the invention and fig. 1, the mass ratio of the slow-soluble solid shell 1, the isotope microsphere 2 and the lipid organic matter is as follows: the mass ratio of the slow-dissolving solid shell 1 is as follows: 60% -65%, and the isotope microsphere 2 comprises the following components in percentage by mass: 30-35 percent of the total weight of lipid organic matters: 5 to 9 percent.
In the embodiment of the invention, the slowly-soluble solid shell 1 made of the temporary plugging agent is utilized, the density and the volume of the spherical shell of the slowly-soluble solid shell and the densities of the isotope microspheres 2 and the lipid organic matters are known, so that the corresponding mixing ratio of the isotope microspheres 2 and the organic matters is calculated, and the density of the whole slowly-soluble solid isotope source reaches 1.01/cm 3 The density is slightly greater than water. Wherein, the mass ratio of the spherical shell, the isotope microsphere 2 and the lipid organic matter is as follows: the spherical shell is as follows: 65%, isotope microsphere 2 is: 30% and lipid organic matter: 5 percent.
According to the invention, the isotope microspheres 2 are loaded into the slow-soluble solid shell 1 and then released into the underground for measurement, so that the problem that the isotope microspheres 2 can be adhered to the underground due to dirt such as dead oil on a well wall when the isotope microspheres 2 are directly released into the underground in the prior art is solved, and even if a tubular column does not leak, the final logging result is consistent with the result of a leakage point due to the isotope microspheres 2 adhered to the underground, so that the isotope microspheres cannot be distinguished. Through long-term test tests, temporary plugging agent particles are selected from slow-dissolving materials such as paraffin and the like and made into a spherical shell, the temporary plugging agent needs about 60 minutes to be completely dissolved in water, the temporary plugging agent can be kept in a spherical state to move underground before being dissolved, and the temporary plugging agent is dissolved after well logging is completed, so that the stratum is prevented from being polluted. The slow-soluble solid shell 1 is provided with pressure transmission micropores 3, so that the internal pressure and the external pressure are the same, and the slow-soluble solid shell is prevented from scattering due to overlarge pressure in the underground, and tests prove that the slow-soluble solid shell 1 can resist pressure and cannot scatter in a well section of 1000 meters in the underground. Because the density of the temporary plugging agent and the isotope microsphere 2 is greater than that of water, lipid organic matters are mixed in the isotope microsphere 2 for blending, so that the whole density of the slow-soluble solid isotope source is close to that of the water, the slow-soluble solid isotope source can move synchronously with the water flow underground, and the influence of the over-high slipping speed on a logging result is prevented.
The invention also provides a well logging method, which comprises the following steps: loading the slow-soluble solid isotope source into a releaser, and releasing the slow-soluble solid isotope source into the measuring well; injecting water into the measuring well; and (3) putting a logging instrument into the measuring well, and performing well-division section point measurement on the measuring well to obtain a tracing curve of the slow-soluble solid isotope source moving in the measuring well.
In the embodiment of the invention, during logging, the water gate of the metering room is closed, the main gate of the well head is closed, the vent gate of the well head is opened, and the pressure in the water injection pipe column is vented. And (4) putting the logging instrument into the first measuring point 10 meters away from the wellhead in the oil pipe to wait for point measurement. And taking out the releaser filled with the slow-dissolving solid isotope source from the lead cylinder, and delivering the release head to the bottom of the incoming water pipe column through the emptying gate and the water injection gate. Releasing the slow-soluble solid isotope source, after releasing, drawing out the releaser, closing the water injection gate, opening the sleeve injection gate, and finally opening the metering room water gate, wherein the slow-soluble solid isotope source is flushed into the oil sleeve annular space of the measuring well by water flow.
The logging instrument is provided with two probes, namely a double-probe short joint, a certain distance is reserved between the two probes, when the slow-dissolving solid isotope source moves downwards, the slow-dissolving solid isotope source firstly passes through the first probe, is detected and recorded by the first probe, a peak value can appear on a tracing curve generated by a detection result, and then when the slow-dissolving solid isotope source passes through the second probe, the slow-dissolving solid isotope source is detected by the second probe and records the peak value.
After the first measuring point is detected, the logging instrument is put to the next measuring point at a speed higher than the flow speed of water in the annular space of the oil sleeve, and the logging instrument waits for the slow-soluble solid isotope source to pass through the measuring point in front of the slow-soluble solid isotope source for point measurement. Before the logging instrument is lowered, the tracking speed needs to be determined in advance according to the water flow from the wellhead, and the lowering speed of the logging instrument is higher than the flow speed of fluid in the well, so that the logging instrument is guaranteed to monitor the slow-soluble solid isotope source. After the point measurement is carried out on the whole well section in a segmented mode, two tracing curves can be formed by data generated by detection results of the two probes.
In the embodiment of the invention, the flow rate of the fluid in the well in the annular space of the oil pipe casing with the inner diameter of 124.26mm and the oil pipe casing with the outer diameter of 73mm is measured as shown in the following table 1, and the tracking speed of the logging instrument is more than 3000m/h.
Table 1: flow and flow rate comparison table in annular space of oil sleeve with inner diameter of 124.26mm and oil pipe with outer diameter of 73mm
The partial graph of the tracing curve of the slow-soluble solid isotope source moving in the measuring well after the measurement is completed by the logging instrument is shown in fig. 2.
The invention also provides a well logging interpretation method, which comprises the following steps: acquiring two tracing curves of the slow-soluble solid isotope source in the measuring well; finding out the front values of the measuring points on the two tracing curves respectively, and subtracting the time corresponding to the two peak values to obtain the time difference.
In the embodiment of the present invention, according to the tracing curves shown in fig. 2, the time difference is obtained by subtracting the time of the corresponding peak values of the two tracing curves at the same measuring point, as shown in table 2 below, where in table 2, t is the time difference.
Table 2: time difference of corresponding peak values of same measuring point on two tracing curves
And acquiring basic information of the measuring well.
In the present invention, the basic information includes: the cross-sectional area of the oil jacket annulus in the measuring well, the injected water quantity of the measuring well and the distance between two detectors of the double-probe short section of the logging instrument are measured.
In the embodiment of the invention, the cross-sectional area of the oil casing annulus of the measuring well with the inner diameter of the inner casing pipe of 124.26mm and the outer diameter of the oil pipe of 73mm is as follows: s =0.0078m 2 . And the distance L =0.8m between the two probes of the double-probe short section. The injected water amount of the measuring well is 280m 3 /d。
And calculating the flow of the measuring point through a flow formula according to the basic information and the time difference.
In the present invention, the flow formula includes:
wherein Q is the flow of the measuring point, m 3 D; s is the cross-sectional area of the oil sleeve annulus, m2; l is the distance between two probes of the double-probe short section, m; t is the time difference, s.
And respectively calculating the flow of all measuring points in the measuring well, calculating the absolute water absorption of the measuring well section between every two adjacent measuring points by a decreasing difference value method according to the flow, and if the absolute water absorption is greater than a preset value, the measuring well section has leakage.
In the embodiment of the invention, the basic information of the measurement well is substituted into a flow formula to calculate the flow of each measurement point in the measurement well, as shown in the following table 3, in the table 3, t is time difference, and Q is the flow of the measurement point.
Table 3: measuring the flow of each measuring point in the well
In the present invention, the decreasing difference formula includes:
Q 0 ＝Q 1 -Q 2 …………………Q n ；
in the formula, Q 0 For measuring absolute water absorption of well section, m 3 /d；Q 1 、Q 2 ……Q n For measuring the flow at the measuring point of the well section, m 3 /d。
In the embodiment of the invention, the flow of two adjacent measuring points in the measuring well is subtracted to obtain the flow difference, the flow difference is the absolute water absorption of the measuring well section between the two adjacent measuring points, and when the absolute water absorption is more than 5m 3 And d, indicating that the measuring well section between the two measuring points has loss. The results of calculating the absolute water absorption of the measurement well section between two adjacent measurement points in the measurement well are shown in table 4 below, where t is the time difference and Q is the flow rate in table 4.
Table 4: absolute water absorption of measuring well section between two adjacent measuring points in measuring well
As can be seen from the calculation results shown in Table 4, the absolute water absorption of the measurement well section at a measurement point depth of 250 to 300m in the measurement well was 28.2m 3 D, greater than 5m of the standard 3 And d, illustrating that the measured well section has loss.
The slow-soluble solid isotope source and the well logging and interpretation method thereof have been tested for more than 70 times, no contamination exists in the well wall in the well logging process, the slow-soluble solid isotope source is slowly diffused in the well, the peak value is obvious, and the slow-soluble solid isotope source is easy to interpret.
The above examples are merely illustrative of the present invention, and are described in more detail, but not intended to limit the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A slow dissolving solid isotope source, comprising: isotope mixed liquid and a slow-soluble solid shell (1);
the isotope mixed liquor is positioned in the slow-soluble solid shell (1), the slow-soluble solid shell (1) is provided with three pressure transmission micropores (3);
the slow-dissolving solid shell (1) is used for preventing the isotope mixed liquor from diffusing too fast or polluting the well wall in the underground;
the slow-soluble solid shell (1) is a spherical shell; the interior of the spherical shell is hollow, and the isotope mixed solution is positioned in the spherical shell;
the spherical shell is made of a fracturing organic temporary plugging agent, the diameter of the spherical shell is 5mm-8mm, and the wall thickness of the spherical shell is 2mm;
the isotope mixed solution comprises: isotope microspheres (2) and lipid organic matter;
the mass ratio of the spherical shell, the isotope microspheres (2) and the lipid organic matters is as follows: the spherical shell accounts for: 65%, the isotope microsphere (2) accounts for: 30%, lipid organic matter: 5 percent.
2. A method for logging a well based on the slow-dissolving solid isotope source of claim 1, comprising the steps of:
loading the slow-soluble solid isotope source into a releaser, and releasing the slow-soluble solid isotope source into the measuring well;
injecting water into the measuring well;
and (3) putting a logging instrument into the measuring well, and performing well division and point measurement on the measuring well to obtain a tracing curve of the slow-dissolving solid isotope source moving in the measuring well.
3. A well logging interpretation method based on the slow-soluble solid isotope source of claim 1, characterized by comprising the following steps:
acquiring two tracing curves of the slow-soluble solid isotope source in the measuring well;
finding out peak values of the measuring points corresponding to the two tracing curves respectively, and subtracting the time corresponding to the two peak values to obtain a time difference;
acquiring basic information of a measuring well;
calculating the flow of the measuring point through a flow formula according to the basic information and the time difference;
and respectively calculating the flow rates of all measuring points in the measuring well, calculating the absolute water absorption capacity of the measuring well section between every two adjacent measuring points by a decreasing difference value method according to the flow rates, and if the absolute water absorption capacity is larger than a preset value, the measuring well section has leakage.
4. The well logging interpretation method of claim 3, wherein the base information comprises: the cross-sectional area of the oil jacket annulus in the measuring well, the injected water quantity of the measuring well and the distance between two detectors of the double-probe short section of the logging instrument are measured.
5. The well logging interpretation method of claim 3 wherein the flow equation comprises:
in the formula:
q is the measured point flow, m 3 D; s is the cross-sectional area of the oil sleeve annulus, m2; l is the distance between two probes of the double-probe short section, m; t is the time difference, s.
6. A well logging interpretation method according to any of claims 3-5, wherein said decreasing difference formula comprises:
Q 0 ＝Q 1 -Q 2 …………………Q n ；
in the formula:
Q 0 for measuring absolute water absorption of well section, m 3 /d；Q 1 、Q 2 ……Q n For measuring the flow at the measuring point of the well section, m 3 /d。
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